AC-DC Converters Value-added type
Instruction Manual
SNDPF-7
SNDPF
3.2 Connection of loaded circuit
¡
Control load current so that it may fl ow only when the terminal
ENA is at “H”.
¡
For connecting the SNDBS/SNDHS series, see FIg.3.1.
¡
For connection of loads except the SNDBS/SNDHS series, please
contact Cosel development department.
3.3 Heatsink
¡
The power supply adopts the conduction cooling system. Attach a
heatshink to the aluminum base plate to cool the power supply for
use.
Refer to 6.2 Derating.
4 Function
4.1 Overcurrent protection
¡
The overcurrent protection circuit is not built-in.
¡
In order to secure the safety, use the fuse at output side for con-
nection of loads except the SNDBS/SNDHS series.
4.2 Overvoltage protection
¡
The overvoltage protection circuit is built-in. The AC input should
be shout down if overvoltage protection is in operation.
When this function operates, the power factor corrector function
does not operate, and output voltage becomes the full-wave recti-
fi ed AC input voltage.
The minimum interval of AC recycling for recovery is a few min-
utes which output voltage drops below 20V.
Remarks:
Please note that the unit’s internal components may be damaged
if excessive voltage (over rated voltage) is applied to output termi-
nal of power supply. This could happen when the customer tests
the overvoltage performance of the unit.
4.3 Thermal protection
¡
Thermal protection circuit is built-in.
If this function comes into effect, shut down the output, eliminate
all possible causes of overheating, and drop the temperature to
normal level.
To prevent the unit from overheating, avoid using the unit in a
dusty, poorly ventilated environment.
¡
When this function operates, the power factor corrector function
does not operate, and output voltage becomes the full-wave recti-
fi ed AC input voltage and ENA output changes into “L”.
¡
When this function operates, the power factor corrector function
does not operate, and output voltage becomes the full-wave recti-
fi ed AC input voltage.
4.4 Enable signal (ENA)
¡
Use ENA to control starting of the loaded power supply.
¡
When inrush current protection circuit is released, ENA outputs “H” .
If load current fl ows without releasing of the circuit, the resistor may
be damaged.
¡
Setting of ENA has two kinds of SNDHS use (ENA-A) and the
SNDHS use (ENA-B).
The setting of ENA-A is possible only in CN2.
Please connect the ENA-A terminal to RC1 terminal of the SNDHS
series.
Table 4.1 Specifi cation of ENA
No.
Item
ENA-A
ENA-B
1
Load of SNDPF1000 SNDHS series
SNDBS series
2
Signal pin
ENA-B/A at CN2
ENA-B at CN1
ENA-B/A at CN2
3
Base pin
-VOUT
4
Setting of SW1
A
B
5
Function
Output possible “H”
Output prohibited “L”
6
Level voltage “H”
5.5V typ at 1mA
7.5V typ at 1mA
7
Level voltage “L”
Open collector
7.5V typ
CN1 ENA-B
-VOUT
CN2 ENA-B/A
2k
W
SW1
AUX
4.7k
W
A
B
Fig.4.1 Internal circuit of ENA
SNDPF1000
CN1
CN2
SW1:ENA-A
SW1:ENA-B
+V
ENA-B
-V
+V
ENA
-V
+V
ENA-B/A
-V
+V
RC1
-V
SNDBS
400/700B
SNDPF1000
CN1
CN2
+V
ENA-B
-V
+V
ENA
-V
+V
ENA-B/A
-V
+V
ENA
-V
SNDBS
400/700B
SNDBS
400/700B
SNDHS
50/100/250B
(a) Example of connection to
ENA using SNDHS
(b) Example of connection to
ENA using SNDBS
Fig.4.2 Example of connection to ENA
OG UPFRHKPFF
